Burglar-alarm.



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APPLIGATION FILED MAY12,` 1910. v 985,720, Patented Feb.28,1911. g 2 sHBBTs-sH-ET 1r.

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BUBGLAR ALARM.

APPLICATION FILED MAY 12, 1910.

985,720. Y Patented Feb.28,1911.

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i um um S14-vento@ @mi-11 como YUnrrnn srArEs Pa"Tf-nn,fr orricaV ANDREW AMBUHL, F SAN FRANCISCO, CALIFORNIA.

BURGLAR-ALARM.

T o all whom 'it may concern.

Be it 4known that I, ANDREW AMBUHL, a citizen of the United States, residing at San Francisco, in the county of San FranciscoV and State of California,-have invented certain new and useful Improvements in Burglar-Alarms; and I do declare the following to be a full, clear, and exact description of With this and other objects in View, the

invention consists of certain novel features of construction, combination and arrangement of parts as will be more fully described and particularly pointed out in the appended claims.

' In the accompanying drawings, Figure 1 is a front elevation with parts broken out of the device applied to a window; Fig.. 2 is a transverse vertical section thereof; Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1; Fig. 4 is a top plan view of the supporting bar; Figs. 5 and 6 are side eleva# ions of therespective knuckle joint mein- In the embodiment illustrated a metal 'cross bar 1 is supported at its opposite ends in the upper e d of the door or window frame as A in w ich it isjto be usedandv is provided with a plurality of longitudinally spaced notches :its 2 for a purpose to be described, the notches at opposite ends ofthe bar being preferably arranged closer together for a purpose hereinafter described. Two laterally spaced parallel metal bars 3/ and 4 are disposed in a plane below the bar 1 with their ends secured to the opposite sides of the window frame or other struc-A ture on which the device is to be mounted. These bars 3 and 4 are spaced apart a sucient distance to receive between them a piu-4 rality of longitudinally spacedgmetal castings as 5 having laterally extending studs as 6, mounted in the bars 3 and 4. `These `castings as 5 are each provided at their lower ends with depending apertured ears as 7 which are designed to be pivotally connected with ears 8 of a casting 9 soldered or Speccam "f Letters Patent Patented Feu. 28.191 1i Application filed May 12, 1910. Serial N0.56V0, 941

otherwise securedtoa ii'etal tube -10,-pref-""' erably composed of brass.V The' ears 8 are preferably provided with lateral studs 8 which project outwardly in opposite directions and are designed to engage the apertured ears 7 of the member 5 and form the pivotal connection therebetween. `This pivotal connection of the members 5 with the member 9 forms knuckle joints whereby the tubes 10 are caused to hang plumb. The tubes 10 are constructed ofA a length slightly less than the height of the frame to which they are to be applied to permit them -to swing freely therein.

A plurality of metal rods as 11 which are preferably longer than the tubes 10 are provided at their upper ends with loops or eyes as 12 through/which the bar 1 passes and which are designed to rest in the notches as 2 in said bar 1. The bar 1 'rearranged in a vertical plane `which extends centrally between the bars 3 andl 4. These rods 11' battery 14, the other wire 15 leading through a bell 16 to the bar 1.` It will thus be obvious that should the tubes 10 be deflected in either direction a contact will be formed between tube 10 and rod 11 energizing the magnet 17 and closing the electric circuit through the armature 17 as shown indotted lines in Fig. 1 which closes the circuit of the beilrand causes the bell tocontinue to ring un il the member 17 is disengaged from the catchl 17b and retnrnedrto normal position as shown in full lines in Fig. 1. Ais provided in the circuit so that when it is A switch 18 j /desired to throw the apparatus out of op-` F rom the foregoing description taken in connection with the accompanying drawingspthe construction and operation of the inventioiiwvill be readily understood without, requiring a more extended explanation.

Various changes inthe form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention asl defined in the appended claims.

I claim` as my invcntionz--f 14. An electric burglar' alarm comprisin vertically spaced metal members connected with the opposite terminals -of an electric circuit,-a metal tube depending from one of said members and mounted to Swin thereon, a metal rod suspended to swing rom theother member wxthln said tube and normally spaced from the side walls thereof.

2'. An electric burglar alarm comprising vertically spaced horizontally disposed metal members, electric wires connected with said members, one of said members having a pluvralitv of longitudinally spaced notches, a

metal rod provided with means for loosely cngagingone of said notches to permit" the free swinging of said rod, a metal tube supported on the other horizontally disposed metal member and surrounding said rod.

3. An electric burglar alarm comprising vertically spaced horizontally disposed metal members, electric 'wires connected with said members. one of said members having a plu'- r'ality ot' longitudinally spaced notches, a. metal i'od provided with means for loosely engaging one of said notches to permit the free swinging of said rod, a metal tube supported on the other horizontally disposed metal member and surrounding said rod,

said tube bein mounted to swing laterally. 4.fAn.electric burglar alarm comprisin horizontal laterally spaced parallel meta bars, an electric circuit having one end connected to one of said bars, a tubular casting arranged between said bars and supported thereby; a metal tube pivotally connected with said casting, an upper metal bar sup ported above said parallel bars in a vertical plane extending centrally between said parallel bars, the other end of the circuit being connected to said upper bar, a metal rod mounted to swing on said upper bar and to depend centrally within said tube. v

5. An electric burglar alarm comprising horizontal laterally spaced parallel metal bars', an electric Vcircuit having'one end co/n.-

nected to one of said bars, a tubular Listing arranged between Said bars and supported thereby, a-l metal tube pivotally connected 'with said casting, an upper metal bar supported above said parallel bars in a vertical -plane extending centrally between said par? allel bars, the other end of the circuit being connected to said upper bar, a metal rod having an eye at its upper end for engagement with said upper bar, and said rod depending within said tube and spaced normally fromV l the side walls thereof.`

In testimony whereof I have hereunto set my h'andrin presence of two subscribing witnesses.

, y Y' ANDREW AMBUHL.

Witnesses: V W'A Loov AMBUHL,

MARTHA E. AMBUHL. 

